🚀 go-pugleaf

In article <1992Sep4.185308.12558@tom.rz.uni-passau.de>, baier@forwiss.uni-passau.de (Joern Baier) writes:
: gandalf:~/prolog/dp 104> prolog
: | ?- [library(date)].
: [consulting /private/projects/quintus/generic/qplib2.5.1/library/date.pl...]
:  [consulting /private/projects/quintus/generic/qplib2.5.1/library/errno.pl...]
:  [errno.pl consulted in module errno 0.500 sec 11,884 bytes]
: ld:
: Undefined:
: gmtime
: localtime
: [ERROR: Foreign interface, call to Unix "ld" failed (error 413)]
:  [Loading of foreign files NOT completed]
: [date.pl consulted in module date 1.333 sec 22,508 bytes]
: 
You have a serious problem there, because gmtime() and localtime() are
UNIX library functions.  More than that, they are required by the ANSI
C standard.  The linker should have found them.  You will need to check
that QP has been installed correctly, and especially to verify that ld
is being called with the correct command-line arguments.

: ----------------------------------------------------------------------
: gandalf:~/prolog/dp/date 111> gcc date.c

You do not want a complete program.  You want a ".o" (object, linkable)
file.  For that, the correct command is
	gcc -c date.c
	    ^^
: date.c: In function `QD4mat':
: date.c:358: warning: suggest parentheses around && within ||
Sheesh.  Does it also say "suggest parentheses around * within +"?
Ignore that message.
: ld:
: Undefined:
: main
: QP_atom_from_string
: collect: /usr/bin/ld returned 1 exit status

: It seems that 'QP_atom_from_string' is not defined.

Yes it is.  It is defined in the Quintus Prolog system itself.
The *.c files in the library area are _not_ meant to be compiled as
separate programs, but as ".o" files which will later be linked with
the Prolog system (either statically, if you so choose when using qpc,
or dynamically, if you use load_foreign_files).  Just add the "-c" option.

-- 
You can lie with statistics ... but not to a statistician.